Corrugated-metal fastener.



E. s. NORTON.

CORRUGATED METAL FASTENER. APPLICATION FILED 05c. 4. 1906.

l 9 1 @fififl 1 I Patent-ed May 9, 1916.

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ELLIOTT S. NORTON, OF CHICAGO, ILLINOIS, ASSIG-NOR TO ACME STEEL GOODS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CORRUGATED-METAL FASTENER.

Specification of Letters Patent.

Patented May a, 19316.

To all whom it may concern:

Be it known that I, ELLIOTT S. NORTON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Corrugated-Metal Fasteners, of which the following is a speci- -top plan.

fication.

- The object of the present invention is to produce a corrugated metal fastener of the divergent type having certain practical advantages hereinafter pointed out.

In the accompanying drawings Figure 1 represents the improved fastener in side elevation; Fig. 2 represents the same in end view Fig. 3 represents the fastener in bot tom plan View; Fig. 4 represents a portion of the fastener in side elevation on an enlarged scale; Fig 5 represents two pieces of wood in section with a driven fastener in side elevation; and 'Fig. 6 represents two pieces of wood with the driven fastener in Referring first to Fig. 1 the reference letter a designates a series of corrugations extending angularly across the metal strip,

the reference letter I) designates similar corrugations extending on the opposite angle and the reference letter 0 designates an intervening corrugation which is tapered from end to end. The fastener is beveled on opposite sides as indicated at (2 along that edge where the wide end of the corrugation 0 occurs. By so beveling the strip on opposite sides as shown in Fig. 2 a. saw-tooth,

formation is effected. This results from the corrugations being cut away angularly to the same extent on both sides. Thus a series of sharp points 6 are produced and between them substantially V-shaped cutting edges f. This is illustrated on an exaggerated scale in Fig. 4;.

In Fig. 5 which illustrates the action of \a fastener of the. present invention wherein the divergent feature is combined with the saw-tooth edge, the two pieces of soft wood 7' and 7c are represented closely drawn together as is found to be the case in practice. As this character of fastener is driven into the wood it is foun that more or less lateral compression of th' wood fibers takeaplace in the V-shaped portions which counteracts any tendency to give way before the cutting edges, the latter going cleanly through the fibers. It therefore follows that the wood continues to hug the corrugations and hence the divergence of the latter is rendered extremely efi'ective so that two pieces of wood will be tightly drawn together as illustrated in this figure and in Fig. 6.

It is furthermore to be observed that the entering pointse are all in the same straight line, and that the side edges of the fastener run at right angles to this line. The driving edge of the fastener lies in aplane parallel with asimilar transverse plane embracing said entering points. The straight-line character of the entering formation-of the fastener, and also the right angle character of the side edges, possess well recognized practical advantages over those prior forms lengthwise convexity at the entering edge and corresponding angularity of side edges. In setting the fastener upon the surface of the wood it is highly desirable that the full series of entering points or short edge sections shall engage that surface so as to insure a square setting of the fastener and simultaneous penetration of all of these points in the interest of straight driving of the fastener into the wood. It is also desirable, particularly where the appearance counts in the article on which the'fastener is used, that no gaps'be left in the wood. The right angle character of the side edges of my fastener insures against anything of this sort in straight driving of the fastener which is itself assured by: the character of the entering formation as above pointed out.

Likewise the straight line character of the driving end of the fastener, besides affording the, best character of head to strike'in of the intermediate corrugation forming a ice series of entering points with intervening draw-cutting edges, said points being all in straight-line with each other.

2. A corrugated metal fastener having an intermediate tapering corrugation and corrugations on opposite sides thereof parallel with the sides of the same respectively, said fastener being beveled on opposite sides along the edge which embraces the wide end of the intermediate corrugation forming a series of entering points with intervening draw-cutting edges, said points being all in intermediate tapering corrugation and corrugations on opposite sides thereof parallel with the sides of the same respectively, said fastener having a sharpened entering for mation embracing the wide end of the intermediate corrugation and lying throughout in a plane transverse to the fastener,

and the side edges of the fastener being at right angles to said plane.

5. A corrugated metal fastener having an intermediate tapering corrugation and corrugations on opposite sides thereof parallel with the sides of the same respectively, said fastenerhaving a sharpened entering formation embracing the wide end of the intermediate corrugation and lying throughout in a plane transverse to the fastener, and said fastener having a driving edge lying in a similar plane.

6. A corrugated metal fastener having an intermediate tapering corrugation and corrugations on opposite sides thereof'parallel with the sides of the same respectively, said fastener having a sharpened entering formation embracing the wide end of the intermediate corrugation and lying throughout in a plane transverse to the fastener, and said fastener having a driving edge lying in a similar plane, and the side edges of the fastener being at right angles to said planes.

ELLIOTT S. NORTON. 

